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Grepper D, Tabasso C, Zanou N, Aguettaz AK, Castro-Sepulveda M, Ziegler DV, Lagarrigue S, Arribat Y, Martinotti A, Ebrahimi A, Daraspe J, Fajas L, Amati F. BCL2L13 at endoplasmic reticulum-mitochondria contact sites regulates calcium homeostasis to maintain skeletal muscle function. iScience 2024; 27:110510. [PMID: 39175772 PMCID: PMC11340602 DOI: 10.1016/j.isci.2024.110510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 03/17/2024] [Accepted: 07/11/2024] [Indexed: 08/24/2024] Open
Abstract
The physical connection between mitochondria and endoplasmic reticulum (ER) is an essential signaling hub to ensure organelle and cellular functions. In skeletal muscle, ER-mitochondria calcium (Ca2+) signaling is crucial to maintain cellular homeostasis during physical activity. High expression of BCL2L13, a member of the BCL-2 family, was suggested as an adaptive response in endurance-trained human subjects. In adult zebrafish, we found that the loss of Bcl2l13 impairs skeletal muscle structure and function. Ca2+ signaling is altered in Bcl2l13 knockout animals and mitochondrial complexes activity is decreased. Organelle fractioning in mammalian cells shows BCL2L13 at mitochondria, ER, and mitochondria-associated membranes. ER-mitochondria contact sites number is not modified by BCL2L13 modulation, but knockdown of BCL2L13 in C2C12 cells changes cytosolic Ca2+ release and mitochondrial Ca2+ uptake. This suggests that BCL2L13 interaction with mitochondria and ER, and its role in Ca2+ signaling, contributes to proper skeletal muscle function.
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Affiliation(s)
- Dogan Grepper
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
| | - Cassandra Tabasso
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
| | - Nadège Zanou
- Institute of Sport Sciences, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Vaud 1015, Switzerland
| | - Axel K.F. Aguettaz
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
- Service of Endocrinology, Diabetes and Metabolism, Lausanne University Hospital and University of Lausanne, Lausanne, Vaud 1011, Switzerland
| | - Mauricio Castro-Sepulveda
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
| | - Dorian V. Ziegler
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Vaud 1015, Switzerland
| | - Sylviane Lagarrigue
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
| | - Yoan Arribat
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
| | - Adrien Martinotti
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
- Service of Endocrinology, Diabetes and Metabolism, Lausanne University Hospital and University of Lausanne, Lausanne, Vaud 1011, Switzerland
| | - Ammar Ebrahimi
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
- Service of Endocrinology, Diabetes and Metabolism, Lausanne University Hospital and University of Lausanne, Lausanne, Vaud 1011, Switzerland
| | - Jean Daraspe
- Electron Microscopy Facility, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Vaud 1015, Switzerland
| | - Lluis Fajas
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Vaud 1015, Switzerland
| | - Francesca Amati
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Bugnon 7, Lausanne, Vaud 1005, Switzerland
- Service of Endocrinology, Diabetes and Metabolism, Lausanne University Hospital and University of Lausanne, Lausanne, Vaud 1011, Switzerland
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Xiao JL, Liu HY, Sun CC, Tang CF. Regulation of Keap1-Nrf2 signaling in health and diseases. Mol Biol Rep 2024; 51:809. [PMID: 39001962 DOI: 10.1007/s11033-024-09771-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2024] [Accepted: 07/01/2024] [Indexed: 07/15/2024]
Abstract
Nuclear factor erythroid 2-related factor 2 (Nrf2) functions as a central regulator in modulating the activities of diverse antioxidant enzymes, maintaining cellular redox balance, and responding to oxidative stress (OS). Kelch-like ECH-associated protein 1 (Keap1) serves as a principal negative modulator in controlling the expression of detoxification and antioxidant genes. It is widely accepted that OS plays a pivotal role in the pathogenesis of various diseases. When OS occurs, leading to inflammatory infiltration of neutrophils, increased secretion of proteases, and the generation of large quantities of reactive oxygen radicals (ROS). These ROS can oxidize or disrupt DNA, lipids, and proteins either directly or indirectly. They also cause gene mutations, lipid peroxidation, and protein denaturation, all of which can result in disease. The Keap1-Nrf2 signaling pathway regulates the balance between oxidants and antioxidants in vivo, maintains the stability of the intracellular environment, and promotes cell growth and repair. However, the antioxidant properties of the Keap1-Nrf2 signaling pathway are reduced in disease. This review overviews the mechanisms of OS generation, the biological properties of Keap1-Nrf2, and the regulatory role of its pathway in health and disease, to explore therapeutic strategies for the Keap1-Nrf2 signaling pathway in different diseases.
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Affiliation(s)
- Jiang-Ling Xiao
- Key Laboratory of Physical Fitness and Exercise Rehabilitation of the Hunan Province, College of Physical Education, Hunan Normal University, Changsha, Hunan, 410012, China
| | - Heng-Yuan Liu
- Key Laboratory of Physical Fitness and Exercise Rehabilitation of the Hunan Province, College of Physical Education, Hunan Normal University, Changsha, Hunan, 410012, China
| | - Chen-Chen Sun
- Institute of Physical Education, Hunan First Normal University, Changsha, Hunan, 410205, China.
| | - Chang-Fa Tang
- Key Laboratory of Physical Fitness and Exercise Rehabilitation of the Hunan Province, College of Physical Education, Hunan Normal University, Changsha, Hunan, 410012, China.
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Aranda-Martínez P, Sayed RKA, Fernández-Martínez J, Ramírez-Casas Y, Yang Y, Escames G, Acuña-Castroviejo D. Zebrafish as a Human Muscle Model for Studying Age-Dependent Sarcopenia and Frailty. Int J Mol Sci 2024; 25:6166. [PMID: 38892357 PMCID: PMC11172448 DOI: 10.3390/ijms25116166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 05/28/2024] [Accepted: 05/29/2024] [Indexed: 06/21/2024] Open
Abstract
Currently, there is an increase in the aging of the population, which represents a risk factor for many diseases, including sarcopenia. Sarcopenia involves progressive loss of mass, strength, and function of the skeletal muscle. Some mechanisms include alterations in muscle structure, reduced regenerative capacity, oxidative stress, mitochondrial dysfunction, and inflammation. The zebrafish has emerged as a new model for studying skeletal muscle aging because of its numerous advantages, including histological and molecular similarity to human skeletal muscle. In this study, we used fish of 2, 10, 30, and 60 months of age. The older fish showed a higher frailty index with a value of 0.250 ± 0.000 because of reduced locomotor activity and alterations in biometric measurements. We observed changes in muscle structure with a decreased number of myocytes (0.031 myocytes/μm2 ± 0.004 at 60 months) and an increase in collagen with aging up to 15% ± 1.639 in the 60-month group, corresponding to alterations in the synthesis, degradation, and differentiation pathways. These changes were accompanied by mitochondrial alterations, such as a nearly 50% reduction in the number of intermyofibrillar mitochondria, 100% mitochondrial damage, and reduced mitochondrial dynamics. Overall, we demonstrated a similarity in the aging processes of muscle aging between zebrafish and mammals.
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Affiliation(s)
- Paula Aranda-Martínez
- Centro de Investigación Biomédica, Facultad de Medicina, Departamento de Fisiología, Universidad de Granada, 18016 Granada, Spain; (P.A.-M.); (J.F.-M.); (Y.R.-C.); (G.E.)
- Instituto de Biotecnología, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, 18016 Granada, Spain
- Instituto de Investigación Biosanitaria (Ibs. Granada), Hospital Universitario San Cecilio, 18016 Granada, Spain
| | - Ramy K. A. Sayed
- Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Sohag University, Sohag 82524, Egypt;
| | - José Fernández-Martínez
- Centro de Investigación Biomédica, Facultad de Medicina, Departamento de Fisiología, Universidad de Granada, 18016 Granada, Spain; (P.A.-M.); (J.F.-M.); (Y.R.-C.); (G.E.)
- Instituto de Biotecnología, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, 18016 Granada, Spain
- Instituto de Investigación Biosanitaria (Ibs. Granada), Hospital Universitario San Cecilio, 18016 Granada, Spain
| | - Yolanda Ramírez-Casas
- Centro de Investigación Biomédica, Facultad de Medicina, Departamento de Fisiología, Universidad de Granada, 18016 Granada, Spain; (P.A.-M.); (J.F.-M.); (Y.R.-C.); (G.E.)
- Instituto de Biotecnología, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, 18016 Granada, Spain
- Instituto de Investigación Biosanitaria (Ibs. Granada), Hospital Universitario San Cecilio, 18016 Granada, Spain
| | - Yang Yang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Faculty of Life Sciences and Medicine, Northwest University, Xi’an 710069, China;
| | - Germaine Escames
- Centro de Investigación Biomédica, Facultad de Medicina, Departamento de Fisiología, Universidad de Granada, 18016 Granada, Spain; (P.A.-M.); (J.F.-M.); (Y.R.-C.); (G.E.)
- Instituto de Biotecnología, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, 18016 Granada, Spain
- Instituto de Investigación Biosanitaria (Ibs. Granada), Hospital Universitario San Cecilio, 18016 Granada, Spain
- Centro de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III (ISCIII), 28029 Madrid, Spain
| | - Darío Acuña-Castroviejo
- Centro de Investigación Biomédica, Facultad de Medicina, Departamento de Fisiología, Universidad de Granada, 18016 Granada, Spain; (P.A.-M.); (J.F.-M.); (Y.R.-C.); (G.E.)
- Instituto de Biotecnología, Parque Tecnológico de Ciencias de la Salud, Universidad de Granada, 18016 Granada, Spain
- Instituto de Investigación Biosanitaria (Ibs. Granada), Hospital Universitario San Cecilio, 18016 Granada, Spain
- Centro de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III (ISCIII), 28029 Madrid, Spain
- UGC de Laboratorios Clínicos, Hospital Universitario San Cecilio, 18016 Granada, Spain
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Foessl I, Ackert-Bicknell CL, Kague E, Laskou F, Jakob F, Karasik D, Obermayer-Pietsch B, Alonso N, Bjørnerem Å, Brandi ML, Busse B, Calado Â, Cebi AH, Christou M, Curran KM, Hald JD, Semeraro MD, Douni E, Duncan EL, Duran I, Formosa MM, Gabet Y, Ghatan S, Gkitakou A, Hassler EM, Högler W, Heino TJ, Hendrickx G, Khashayar P, Kiel DP, Koromani F, Langdahl B, Lopes P, Mäkitie O, Maurizi A, Medina-Gomez C, Ntzani E, Ohlsson C, Prijatelj V, Rabionet R, Reppe S, Rivadeneira F, Roshchupkin G, Sharma N, Søe K, Styrkarsdottir U, Szulc P, Teti A, Tobias J, Valjevac A, van de Peppel J, van der Eerden B, van Rietbergen B, Zekic T, Zillikens MC. A perspective on muscle phenotyping in musculoskeletal research. Trends Endocrinol Metab 2024; 35:478-489. [PMID: 38553405 DOI: 10.1016/j.tem.2024.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 01/13/2024] [Accepted: 01/16/2024] [Indexed: 05/12/2024]
Abstract
Musculoskeletal research should synergistically investigate bone and muscle to inform approaches for maintaining mobility and to avoid bone fractures. The relationship between sarcopenia and osteoporosis, integrated in the term 'osteosarcopenia', is underscored by the close association shown between these two conditions in many studies, whereby one entity emerges as a predictor of the other. In a recent workshop of Working Group (WG) 2 of the EU Cooperation in Science and Technology (COST) Action 'Genomics of MusculoSkeletal traits Translational Network' (GEMSTONE) consortium (CA18139), muscle characterization was highlighted as being important, but currently under-recognized in the musculoskeletal field. Here, we summarize the opinions of the Consortium and research questions around translational and clinical musculoskeletal research, discussing muscle phenotyping in human experimental research and in two animal models: zebrafish and mouse.
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Affiliation(s)
- Ines Foessl
- Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria.
| | - Cheryl L Ackert-Bicknell
- Colorado Program for Musculoskeletal Research, Department of Orthopedics, University of Colorado, Aurora, CO, USA
| | - Erika Kague
- Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, UK
| | | | - Franz Jakob
- Bernhard-Heine-Centrum für Bewegungsforschung und Lehrstuhl für Funktionswerkstoffe der Medizin und der Zahnheilkunde, Würzburg, Germany
| | - David Karasik
- Azrieli Faculty of Medicine, Bar-Ilan University, Ramat Gan, Israel
| | - Barbara Obermayer-Pietsch
- Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
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5
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Livshits G, Kalinkovich A. Restoration of epigenetic impairment in the skeletal muscle and chronic inflammation resolution as a therapeutic approach in sarcopenia. Ageing Res Rev 2024; 96:102267. [PMID: 38462046 DOI: 10.1016/j.arr.2024.102267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/17/2024] [Accepted: 03/06/2024] [Indexed: 03/12/2024]
Abstract
Sarcopenia is an age-associated loss of skeletal muscle mass, strength, and function, accompanied by severe adverse health outcomes, such as falls and fractures, functional decline, high health costs, and mortality. Hence, its prevention and treatment have become increasingly urgent. However, despite the wide prevalence and extensive research on sarcopenia, no FDA-approved disease-modifying drugs exist. This is probably due to a poor understanding of the mechanisms underlying its pathophysiology. Recent evidence demonstrate that sarcopenia development is characterized by two key elements: (i) epigenetic dysregulation of multiple molecular pathways associated with sarcopenia pathogenesis, such as protein remodeling, insulin resistance, mitochondria impairments, and (ii) the creation of a systemic, chronic, low-grade inflammation (SCLGI). In this review, we focus on the epigenetic regulators that have been implicated in skeletal muscle deterioration, their individual roles, and possible crosstalk. We also discuss epidrugs, which are the pharmaceuticals with the potential to restore the epigenetic mechanisms deregulated in sarcopenia. In addition, we discuss the mechanisms underlying failed SCLGI resolution in sarcopenia and the potential application of pro-resolving molecules, comprising specialized pro-resolving mediators (SPMs) and their stable mimetics and receptor agonists. These compounds, as well as epidrugs, reveal beneficial effects in preclinical studies related to sarcopenia. Based on these encouraging observations, we propose the combination of epidrugs with SCLI-resolving agents as a new therapeutic approach for sarcopenia that can effectively attenuate of its manifestations.
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Affiliation(s)
- Gregory Livshits
- Department of Morphological Sciences, Adelson School of Medicine, Ariel University, Ariel 4077625, Israel; Department of Anatomy and Anthropology, Faculty of Medical and Health Sciences, School of Medicine, Tel-Aviv University, Tel-Aviv 6905126, Israel.
| | - Alexander Kalinkovich
- Department of Anatomy and Anthropology, Faculty of Medical and Health Sciences, School of Medicine, Tel-Aviv University, Tel-Aviv 6905126, Israel
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6
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Xiao Q, Sun CC, Tang CF. Heme oxygenase-1: A potential therapeutic target for improving skeletal muscle atrophy. Exp Gerontol 2023; 184:112335. [PMID: 37984695 DOI: 10.1016/j.exger.2023.112335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 11/11/2023] [Accepted: 11/17/2023] [Indexed: 11/22/2023]
Abstract
Skeletal muscle atrophy is a common muscle disease that is directly caused by an imbalance in protein synthesis and degradation. At the histological level, it is mainly characterized by a reduction in muscle mass and fiber cross-sectional area (CSA). Patients with skeletal muscle atrophy present with reduced motor ability, easy fatigue, and poor life quality. Heme oxygenase-1 (HO-1) is an inducible enzyme that catalyzes the degradation of heme and has attracted much attention for its anti-oxidation effects. In addition, there is growing evidence that HO-1 plays an important role in anti-inflammatory, anti-apoptosis, pro-angiogenesis, and maintaining skeletal muscle homeostasis, making it a potential therapeutic target for improving skeletal muscle atrophy. Here, we review the pathogenesis of skeletal muscle atrophy, the biology of HO-1 and its regulation, and the biological function of HO-1 in skeletal muscle homeostasis, with a specific focus on the role of HO-1 in skeletal muscle atrophy, aiming to observe the therapeutic potential of HO-1 for skeletal muscle atrophy.
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Affiliation(s)
- Qin Xiao
- Key Laboratory of Physical Fitness and Exercise Rehabilitation of the Hunan Province, College of Physical Education, Hunan Normal University, Changsha, Hunan 410012, China; School of Physical Education, Hunan First Normal University, Changsha, Hunan 410205, China
| | - Chen-Chen Sun
- School of Physical Education, Hunan First Normal University, Changsha, Hunan 410205, China.
| | - Chang-Fa Tang
- Key Laboratory of Physical Fitness and Exercise Rehabilitation of the Hunan Province, College of Physical Education, Hunan Normal University, Changsha, Hunan 410012, China.
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7
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Callegari S, Mirzaei F, Agbaria L, Shariff S, Kantawala B, Moronge D, Ogendi BMO. Zebrafish as an Emerging Model for Sarcopenia: Considerations, Current Insights, and Future Directions. Int J Mol Sci 2023; 24:17018. [PMID: 38069340 PMCID: PMC10707505 DOI: 10.3390/ijms242317018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 11/23/2023] [Accepted: 11/28/2023] [Indexed: 12/18/2023] Open
Abstract
Sarcopenia poses a significant challenge to public health and can severely impact the quality of life of aging populations. Despite extensive efforts to study muscle degeneration using traditional animal models, there is still a lack of effective diagnostic tools, precise biomarkers, and treatments for sarcopenia. Zebrafish models have emerged as powerful tools in biomedical research, providing unique insights into age-related muscle disorders like sarcopenia. The advantages of using zebrafish models include their rapid growth outside of the embryo, optical transparency during early developmental stages, high reproductive potential, ease of husbandry, compact size, and genetic tractability. By deepening our understanding of the molecular processes underlying sarcopenia, we may develop novel diagnostic tools and effective treatments that can improve the lives of aging individuals affected by this condition. This review aims to explore the unique advantages of zebrafish as a model for sarcopenia research, highlight recent breakthroughs, outline potential avenues for future investigations, and emphasize the distinctive contributions that zebrafish models offer. Our research endeavors to contribute significantly to address the urgent need for practical solutions to reduce the impact of sarcopenia on aging populations, ultimately striving to enhance the quality of life for individuals affected by this condition.
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Affiliation(s)
- Santiago Callegari
- Vascular Medicine Outcomes Laboratory, Cardiology Department, Yale University, New Haven, CT 06510, USA
| | - Foad Mirzaei
- Faculty of General Medicine, Yerevan State Medical University after Mikhtar Heratsi, 2 Koryun, Yerevan 0025, Armenia; (F.M.); (L.A.); (B.K.)
| | - Lila Agbaria
- Faculty of General Medicine, Yerevan State Medical University after Mikhtar Heratsi, 2 Koryun, Yerevan 0025, Armenia; (F.M.); (L.A.); (B.K.)
| | - Sanobar Shariff
- Faculty of General Medicine, Yerevan State Medical University after Mikhtar Heratsi, 2 Koryun, Yerevan 0025, Armenia; (F.M.); (L.A.); (B.K.)
| | - Burhan Kantawala
- Faculty of General Medicine, Yerevan State Medical University after Mikhtar Heratsi, 2 Koryun, Yerevan 0025, Armenia; (F.M.); (L.A.); (B.K.)
| | - Desmond Moronge
- Department of Physiology, Medical College of Georgia, Augusta, GA 30912, USA;
| | - Brian M. O. Ogendi
- Department of Medicine, Michigan State University College of Human Medicine, Grand Rapids, MI 49503, USA;
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8
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Wang JF, Wen DT, Wang SJ, Gao YH, Yin XY. Muscle-specific overexpression of Atg2 gene and endurance exercise delay age-related deteriorations of skeletal muscle and heart function via activating the AMPK/Sirt1/PGC-1α pathway in male Drosophila. FASEB J 2023; 37:e23214. [PMID: 37773768 DOI: 10.1096/fj.202301312r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/29/2023] [Accepted: 09/08/2023] [Indexed: 10/01/2023]
Abstract
Atg2 is a key gene in autophagy formation and plays an important role in regulating aging progress. Exercise is an important tool to resist oxidative stress in cells and delay muscle aging. However, the relationship between exercise and the muscle Atg2 gene in regulating skeletal muscle aging remains unclear. Here, overexpression or knockdown of muscle Atg2 gene was achieved by constructing the AtgUAS/MhcGal4 system in Drosophila, and these flies were also subjected to an exercise intervention for 2 weeks. The results showed that both overexpression of Atg2 and exercise significantly increased the climbing speed, climbing endurance, cardiac function, and lifespan of aging flies. They also significantly up-regulated the expression of muscle Atg2, AMPK, Sirt1, and PGC-1α genes, and they significantly reduced muscle malondialdehyde and triglyceride. These positive benefits were even more pronounced when the two were combined. However, the effects of Atg2 knockdown on skeletal muscle, heart, and lifespan were reversed compared to its overexpression. Importantly, exercise ameliorated age-related changes induced by Atg2 knockdown. Therefore, current results confirmed that both overexpression of muscle Atg2 and exercise delayed age-related deteriorations of skeletal muscle, the heart function, and lifespan, and exercise could also reverse age-related changes induced by Atg2 knockdown. The molecular mechanism is related to the overexpression of the Atg2 gene and exercise, which increase the activity of the AMPK/Sirt1/PGC-1α pathway, oxidation and antioxidant balance, and lipid metabolism in aging muscle.
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Affiliation(s)
- Jing-Feng Wang
- School of Physical Education, Ludong University, Yantai, P.R. China
| | - Deng-Tai Wen
- School of Physical Education, Ludong University, Yantai, P.R. China
| | - Shi-Jie Wang
- School of Physical Education, Ludong University, Yantai, P.R. China
| | - Ying-Hui Gao
- School of Physical Education, Ludong University, Yantai, P.R. China
| | - Xin-Yuan Yin
- School of Physical Education, Ludong University, Yantai, P.R. China
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